Gedlee on distortion

[Face]

Re: Gedlee on distortion

Wow, those are some 'no holes barred' speakers! The closest dealer to me is in NYC.
Of course, being German made, why not German drivers; in some of them at least. I found it unusual they even detail the brands of crossover parts they used. Not many do, probably because they are not using Duelunds and Mun. Silver/Gold brands.

I heard them at the NY Audio show a few years ago, they sounded nice.

[craigk]

Re: Gedlee on distortion

Wow, those are some 'no holes barred' speakers! The closest dealer to me is in NYC.
Of course, being German made, why not German drivers; in some of them at least. I found it unusual they even detail the brands of crossover parts they used. Not many do, probably because they are not using Duelunds and Mun. Silver/Gold brands.

A group of us listened to them at Axpona and agreed they were in the top 2 or 3 speakers at the show. I thought they were the best.

[mattsk8]

Re: Gedlee on distortion

Do you have or know of a build with those AMT's in it?

Did some research and went through my Axpona and my CES pics, Legacy Audio uses them in a couple different builds, but I can't find a pic of the ones I was referring to :(.

[r-carpenter]

Re: Gedlee on distortion

http://legacyaudio.com/products/view/silhouette/

To me as wells as to a couple of my friends, this was the best sounding speaker on the last NY Audio show. It uses AMT type tweeter.

[mattsk8]

Re: Gedlee on distortion

http://legacyaudio.com/products/view/silhouette/
To me as wells as to a couple of my friends, this was the best sounding speaker on the last NY Audio show. It uses AMT type tweeter.

I'm pretty sure those are Mundorfs, just not sure which models. I think Lawrence Audio uses a smaller Mundorf AMT in one of their designs too. I know Lawrence mainly uses ribbons, but they had one that had a ribbon and a AMT in it.

[carlspeak]

Re: Gedlee on distortion

Here is some real stress test data. I risked damage to one of my AMT's this afternoon and ran 2 FR tests at 70 and 95 dB (peak meas. of HOM log sweep). Meas. taken on axis at 2 ft. and smoothed to 1/24th oct.

Below is a magnified difference chart over the range of the tweeter.

What I see is, when stressed, the AMT starts to get peaky (e.g. +dB) in spots. It seems to be about 2 dB worse case overall and about 1.5 dB on average.

For those of you who want to try this with your speakers, use HOM and run an A and B test at two significantly different dB levels. Then, using the manipulation function, click on C=A/B. CAUTION, this is really when you need to wear ear protection if you wander into the 90+ dB range.

[mattsk8]

Re: Gedlee on distortion

Interesting measuents Carl, thanks. I'll play with it. How's it sound when you get heavy on the volume? Do those peaks and dips start to get very audible? It looks like it's still consistent, so I wonder if your ears fill it all in and they still sound good?

[Jeff B.]

Re: Gedlee on distortion

Interesting measuents Carl, thanks. I'll play with it. How's it sound when you get heavy on the volume? Do those peaks and dips start to get very audible? It looks like it's still consistent, so I wonder if your ears fill it all in and they still sound good?

Take a close look at the scale. It's not really fair to call those peaks and dips, they're more like wiggles. You're going to perceive that as pretty smooth and flat.

[dlr]

Re: Gedlee on distortion

Now let's continue with this awesome discussion on distortion.

I went to Sydney's link to audioxpress.com and found another interesting article. This one is by Wolfgang Klippel and Robert Werner.

Measurement and Perception of Regular Loudspeaker Distortion

I haven't read through the whole article yet, but what I have read is very interesting. It includes a number of good references, most Klippel's, but not all. I would say that for anyone interested in loudspeaker distortion, this is an excellent place to start.

dlr

[winslow]

Re: Gedlee on distortion

How well do Klippel and Geddes align? It has been a couple of years since I read (as best I could) "Audio Transducers" by Geddes.

[Sydney]

Re: Gedlee on distortion

...found another interesting article. This one is by Wolfgang Klippel and Robert Werner.

Measurement and Perception of Regular Loudspeaker Distortion...

Nice referencing Dave

[Deward Hastings]

Re: Gedlee on distortion

How well do Klippel and Geddes align?

They are singing from the same hymnal. Geddes may insert a little more "opinion" in his forum and blog posts (and certainly more in his product promotion) but the "science" and the conclusions are essentially the same: "mechanics" determines the nature and causes of loudspeaker distortion, distortion can be measured and quantified (although not necessarily easily and not in a single metric), the audibility and importance of various distortions can be determined, and we measure things that we don't hear and hear things that we don't measure (at least not very well, yet). They are in broad agreement that for any particular distortion there is a level below which it doesn't matter.

[carlspeak]

Re: Gedlee on distortion

Interesting measuents Carl, thanks. I'll play with it. How's it sound when you get heavy on the volume? Do those peaks and dips start to get very audible? It looks like it's still consistent, so I wonder if your ears fill it all in and they still sound good?

Signal too loud for me at 95 dB. I was wearing hearing protection and thus could not listen for distortion. As Jeff pointed out, the wiggles are basically insignificant as far as I am concerned.
My conclusion, this is a damn good tweeter.

[mattsk8]

Re: Gedlee on distortion

Signal too loud for me at 95 dB. I was wearing hearing protection and thus could not listen for distortion. As Jeff pointed out, the wiggles are basically insignificant as far as I am concerned.
My conclusion, this is a damn good tweeter.

It's too bad you're so far away. Ever since I heard Mundorfs, my dream is to use them in a "end all, be all" design, but I'm afraid to drop the money. If only I could hear yours

[rickcraig]

Re: Gedlee on distortion

I see. So when THD is too high, you cross above or below that point? I doubt there is a steadfast rule, but when is it "too" much THD?

Oh really? Did you attend IU?



And when THD is "average", your driver is probably nothing special?

Sorry for my late reply. I think you already received some good answers on the distortion issue so I really have nothing to add. I'm originally from Fort Wayne and worked in Bloomington for awhile back in the 80's.